Piston and piston-packing.



No. 873,806. l 1 PATENTED DEG. 17, 1907,

` M. H. SULLIVAN.

PISTON AND PISTON PACKING.

APPLICATION FILED APB.9.1907.

3 SHEETS-SHEET 2,

M @L i n ll'oml PATEN'I'ED DEC. 17, 1907.

M. H. SULLIVAN. PISTON AND PIS'ION PACKING.

APPLIGATION FILED APR.9. 1907.

3 SHEETS-SHEET 3.

@vi/imam@ PISTON-'AND PISTONfPACKING.

PATEr MICHAEL H. SLLIVA, O F POUGHKEEPSIE, NEW YORK.

Specification of Letters Patent.

Application filed April 9| 1907 STQINO- 367384 Patented Dec. 1'7,

To all whom it may concern;

Be it known that I, VMICHAEL H. SULL'I- VAN, a citizen of the UnitedStates'7 residing at Poughkeepsie, in the county of Dutchess and Stateof NewYork, have invented new land useful Improvements in Pistons andPiston-Packings, of which the following is a specification.` l' Myinvention is' animproved piston and piston packing for steam engines,and it consists in the construction, combination and arrangement ofdevices hereinafter described and claimed. l vOne object of my inventionisto effect improvements in the means for effecting steam-tight packingbetween the piston and the cylinder and to minimize friction be-c tweenthem.

A further object is to provide improved means for centeringa piston inthe cylinder and for preventing the bore of the cylinder from becomingeccentrically enlargedby the friction between it and the piston-f Afurther object Yis to provide improved means to prevent the steam'vrings from turning.l

AA further object is. to provide an improved iston of the built-up type,the parts of whiclli) may bejreadily adjusted and which may be readilyassembled and disassembled.

.In the accompanying drawings,-Figure 1 is a side elevation 'of a pistonand piston packings embodying my improvements, one of the steam ringsand its stop segment being shown insection Fig. 2 is an end elevation ofthetsame with a portion of the follower plate removed; Fig. 3 is alongitudinal sectional view of the same; Fig. 4 is a transversesectional view, taken on the plane indicated lby ,the line d-a of Fig. 3and intersecting the bull ring and the inner and Outer carrier rings;Fig. 5 is asimilar view taken on then lane indicated by the line b-b ofFig. 3 andp intersecting one of the steam rings; Fig. 6 isa detailelevation of one of the steam rings; and Fig. 7 is a detail perspectiveview of one of the stop segments.-

r The piston 1 is of the built-up type, comprising the spider 2, havingthe flange 3` on one side and the detachable followerr late 4,saidvfollower plat'e being secured in p ace by bolts 5. In the annular,vcircumferential channel 6, around the iston, formedL between the flange3 and t e follower plate is a bull ring 7, which has on its periphery abroad central, annular, circumferential channel 8, and annular,circumferential sidey grooves 9 The inside diameter of the bull ring isgreater thanA that of the channeled i portion of the piston and saidbull vring is spaced from the bottom of said channel and adjustablysecured concentrically with reference to the piston by adjusting screws10, which are disposed radially, engage threaded openings in the iston,have their heads` bearing against t e inner side of the bull ring, andare provided with lock nuts 11. Said bull ring is provided, preferably.at points coincident with the center of its channel 8, withradially-disposed screws 12which operate in threaded openings therein,'and the 'outer ends of which project into said channel 8. Lock nuts 13are provided for said 'adjusting screws 12, as shown.

, "In the channel 8' of the bull ring are inner and outer carrier rings14, 15. Said inner carrier ring is com osed of separate,independently-adjustab e se ments, which are engaged and adjusted y thescrews 12.n The outer carrier ring 15 is open on one side and hasshouldered overlapping ends 16, v .which form` a lapped joint.

springs 17, which may be of the form here s own or of lany othersuitable form are interposed between the inner and outer carrier ringsand form a connection between them which is elastic to some extent.carrier ring engages the bore of the cylinder and serves to minimizefriction between the piston and-cylinder and also to center the pistonin the cylinder, such centering being effected by the adjusting screws12. In the outer sides .of the annular lanes of the bull ring, whichflanges form the si channels 8 and 9 are recesses 18.

In .each of the side channels -9 of the bull ring 1s a steam ring 19, oen at one side, asl

at 20. Said steam rings a so engage the bore of the cylinder and eachlhas an outstanding lateral flange 21, saidy flanges of the respectivesteam rin s' respectively overhanging the flange 3 of ti follower plate4, as shown. In one end -of each steam ring, in the side thereof opposedto the proximate flange of the bull'ring, is a the bottom of said recessis a recess 22. At notch 23. A longitudinal groove 24kis in the t ereofwhich is op 'osed to t e proximate flange of the bull ring. topsegments25 have their op osite'ends, which lie in different parallel panes,disposed in the .recesses Cuslnomng The outer` e walls of the v epistonand the edge of the lpposite end of each steam rin in thel sidethe recesses 18 of ne ends of the said ainst the shoulders ne recesses18, 22, and

ents are held against g and serve to prevent 09g turning thereon. The j),5p segment which lies 1n @bf the steam rings has an fi .amg lug 26 toenter the notch ,i said steam ring, and the arm or end of ich stopsegment which lies in the recess 18 of the proximate bull ring flangehas a'laterallyrojecting, longitudinal flange 27 to enter t e groove 24of said steam ring. `Said stop rings, in addition to preventing thesteam ringsfrom turning, also serve to close the joints at the opensides of said steam rings and hence increase the efficiency of the 2osteam rings and enable them to be the more' readily expanded by"l thesteam pressure in the cylinder -and caused to effect steamtiglht packingbetween the pistonand the cy inder. Moreover, the steam rings can ex- 25pand and contract without affecting the stop segments or danger ofbreaking the connec- .tions between them and the stop segments.

From 'the fore oing description, taken in connectionwithtIieaccompanying drawings, 3 0 the construction and operation o f theinvention will be readily understood without requiring a more extendedex lanation.

Various changes in the orm, proportion and the minor details ofconstructlonmay be resorted to without departing from the principle orsacrificing any of the advantages of this invention, as defined bythe'appended claims; s K y Having thus described my invention, what v 40 Iclaim as new, and desire to secure by Letters-Patent, is,-

1. A piston having an annular circumferential channel, a bull ring insaid channel fand vhaving annular circumferential central and sidechannels in the outer side, steam .rings in the -said side channels, acarrier ring l`in said central channel, means to adjust the bull` ringwith reference to the piston and means .to adjust the carrier ring withreferenceto the'bull ring.

v 2. A piston having an annular circumferential channel, a bull ring insaid channel and havingan annular circumferential channel in its outerside, av carrier ring in said channelof the bull ring, means to adjustthe bull ring with reference to the piston, and means to adjust thecarrier ring with reference to the bull ring.

3. A piston having ari-.annular circumferential channel, a bull ring insaid channel and having an annular circumferential channel its outerside, screws, carried by the piston to adjust the bull ring, a carrierring in the said channel of the bull-ring, and screws, carried by thebull ring to adjust said carrier rlng.

4. A piston having an element provided with 'an exterior annularcircumferential channel and a recess at one side of saidchannel, an opensteam ring in said channel,` havy ing a recess in the side opposed tothe recessed -side of said channel, and a stop element extending acrossthe open side of said ring, lying in the said recesses, and connected tothe end portion of said ring.

5. A piston having an element provided with yan exterior annularcircumferential channel and a recess at one `side of said channel, an;open steam ring in 'said channel, having a recess in the, side opposedto the re`80 cessed side of said channel, and a stop element'extendingacross the open side of said ring, lying in the said recesses andsecured to one end portion of the ring and slidably secured to the otherend portion of the ring to permit contraction and expansion of saidring.

6. A piston having an element provided with an exterior annularcircumferential channel and a recess at one side of said chan- 90 nel,an open steam ring in said channel, having a recess in the side opposedto the recessed side of said channel, and a stop element extendingacross the open side ofsaid ring and lying in the said recesses, saidring having a notch in its inner sidenear one end, and a longitudinalslot in its other end, and

said stop element havingia lateral lug to enter said notch and a lug toenter and plajT longitudinally in the said slotas said ring 'contractsand expands.

7. A piston having an annular circumferential channel, a bull ring insaid channel and having an annular circumferential exterior channehmeansto adjust said bull ring, inner 106 and outer carrier rings in said bullring channel, a `yielding expansion element between said inner and outercarrier rings, and means toadjust'said carrier rings.

8. A piston having an annular circumfer'- 110 ential channel, a bull insaid channel and having an annular circumferential channel in its outerface, means carried Aby the piston to adjust the bull ring, a carrierring in the said channel of the bull ring, and means carried by the bullring to adjust said carrier ring.

In 4testimony whereof I have signed my name to this specification inthe'presence of two subscribing witnesses.

MICHAEL H. SULLIVAN.

